So ... what sets Shin apart from P5 Del?
Aside the obvious family tree.
Shin's Joker outfit is inspired by his Father's general wear of a red coat
Whereas Deluge's Joker outfit is just purple.
Considering what just happened to Shin, He's probably using Alastor as his main weapon.
Deluge continues to be a knife and dagger user.
There's a bit more to Deluge's family tree, in that his parents are in the middle of a divorce since Deluge's criminal charges were brought up.
His mother, @rpking99 's Akari Amamiya, or in this context, Akari Decade, is a police negotiator. For obvious bias and parental reasons, she could not interfer with his case at all.
His father is out of the picture, being one who did nothing to defend him, thinking him a delinquent.
His sister is Kasumi Yoshizawa, taking on her mother's maiden name since the divorce proceedings, since she believes her brother's innocence. She travels with Deluge to Tokyo so he won't be lonely, though she has to live in an apartment paid by Akari, so to not interfer with the probation restrictions.
In RPs with RPKing, She's Rin Amamiya.
(If you've seen my RPs with RPKing, You might noticed that they're a lot more closer now that he's returned home)